A certificate chain, also known as a trust chain, is a sequence of digital certificates that are used to establish the trustworthiness of a particular digital certificate. A digital certificate is issued by a Certificate Authority (CA) and is used to verify the identity of a specific entity or website and to establish a secure communication channel. A certificate chain is composed of the end-entity certificate, intermediate certificate, and root certificate. The root certificate is the highest level certificate in the chain and is used to establish the other certificates' trustworthiness. The intermediate certificates confirm a chain of trust between the root certificate and the end-entity certificate.

ThreatNG Security is an external attack surface management, digital risk assessment, and security ratings solution that can assist organizations with their certificate chain by monitoring and managing their digital certificates, identifying potential vulnerabilities and threats, and providing an assessment of their certificate chain to prioritize security efforts. This ensures that the certificate chain is valid, properly configured, and secure to protect against cyberattacks, such as man-in-the-middle attacks, and maintain trust in the certificates issued by the organization.